Notes are the written pitch.
Frequencies are the sounding frequency, for Bb saxophone.
Unless otherwise stated, the impedance spectrum is for a Bb saxophone.

Impedance spectrum of a Bb tenor
saxophone measured using fingering for B5.

This is the tenth note in the second register. It differs from B4 (the corresponding note in the first register) in that it uses a register hole. This causes a leak in the bore that weakens the first impedance peak, but has little affect on higher peaks – see register hole for an explanation, and compare with B4, whose impedance spectrum is almost identical except for the first peak. Above about 1 kHz, the third peak is weakened and the rest of the curve is irregular: see the discussion in cut-off frequency. Above this frequency, the spacing of peaks in the upper part of the curve roughly equals that in the curve for the lowest note, A#3. This is because, at high frequency, the wave propagates past the open tone holes, reflecting only at the bell.